(19)
(11) EP 2 708 855 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.10.2015 Bulletin 2015/43

(43) Date of publication A2:
19.03.2014 Bulletin 2014/12

(21) Application number: 13182730.5

(22) Date of filing: 03.09.2013
(51) International Patent Classification (IPC): 
G01D 5/245(2006.01)
 G01D 5/347(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 13.09.2012 JP 2012201707

(71) Applicant: Canon Kabushiki Kaisha
Tokyo 146-8501 (JP)

(72) Inventors:
  • Ishizuka, Ko
    Tokyo Tokyo 146-8501 (JP)
  • Ogasawara, Makiko
    Tokyo Tokyo 146-8501 (JP)

(74) Representative: TBK 
Bavariaring 4-6
80336 München
80336 München (DE)

   


(54) Two-dimensional absolute encoder and scale


(57) A two-dimensional absolute encoder includes a scale (SCL) having marks arranged thereon along first and second directions different from each other, a detector (PDA(X), PDA(Y)) configured to perform first detection that detects rows of a first number of marks arranged in the first direction and second detection that detects rows of a second number of marks arranged in the second direction, and a processor (PRC) configured to determine absolute positions of the scale in the first and second directions based on outputs from the detector. Each of the marks has one of different characteristic values each corresponding to a combination of a quantized first code for indicating a position in the first direction and a quantized second code for indicating a position in the second direction, the number of the different characteristic values being smaller than the number of the combinations.







Search report









Search report